The present work is the continuation of the experiment inaugurated in 1983. The model constructed in 1983 for the growth of various organs of the rice plant is solved by means of the trapezoidal method, resulting in a recurrence formula which described the processes of rice growth and yield formation. Preliminary investigation is also made on the assimilative ability, the assimilator distribution and the transition of the rice population. Optimal solutions of the model parameters are determined through optimization. Also simulated are the processes of rice growth and yield formation in 1984.